Question

why should a magnesium ribbon be cleaned before burning in air?

Answer 1

Magnesium ribbon is cleaned before burning it in air in order to remove oxide layer, presence of which slowdowns the oxidation process. So, by cleaning it, the burning process takes place easily.

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Answer 2

Because magnesium reacts with oxygen very rapidly and forms an inert layer on magnesium which prevents further burning of magnesium ribbon in the activity ....

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